A Pulse Pairing Method Based on Substring Search

Abstract

The invention discloses a pulse pairing method based on substring search, which can more quickly handle the situations of larger received pulses and less target radiation source pulses, and reduce false peak influences formed by a cross term, and belongs to the technical field of signal processing. The method comprises the following steps: firstly, performing pulse pre-sorting on a pulse sequence received by a master station, so as to obtain a pulse time interval sequence PRI1 of the master station, and quantifying; determining a time range of a corresponding secondary station, and obtaining a pulse time interval sequence PRI2 of the secondary station; constructing n suffixes of the sequence PRI1 and the sequence PRI2 for dictionary comparison sorting; screening two adjacent suffixes respectively belonging to the mater station and the secondary station and taking the maximum common prefix of the two adjacent suffixes; obtaining corresponding pulse trains, respectively used as a master station substring and a secondary station substring, of the maximum common prefix in the master station and the secondary station; performing joint operation on the master station substring and the secondary station substring, and then re-ordering according to an average time difference value, so as to obtain a pulse pairing result.

Description

Technical field [0001] The invention relates to a pulse pairing method based on substring search, which belongs to the field of signal processing. Background technique [0002] Passive time difference positioning, also known as hyperbolic positioning, is to locate the radiation source by processing the arrival time of signals collected by three or more stations. Baselines are formed between different stations, each baseline corresponds to a hyperbola, and multiple hyperboloids intersect at a point, which is the position of the radiation source. Therefore, pairing the pulse sequence of the same radiation source received by different base stations to obtain an accurate time difference is the key to achieving passive positioning. [0003] Current pulse pairing methods mostly use pulse pairing histograms to pair pulses from two base stations with a time difference of arrival within the time difference range to obtain a pulse pair, and calculate the time difference of the pulse pair; t...

AI Technical Summary

Problems solved by technology

There are two main defects in the histogram method: one is the large amount of calculation; the other is that the cross items formed by the pairing of non-identical pulses in the two stations may accumulate into false peaks; the third is that if the pulse sequences received by the two stations belong to the target If the number of radiation sources is small, the effect of real time difference accumulation cannot significantly exceed the histogram false peak or even the histogram noise

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